The Y chromosome determines maleness in humans.

• Sex Chromosomes
  (http://www.ultranet.com/~jkimball/BiologyPages/S/SexChromosomes.html) This site gives a good overview of sex chromosomes, including the role of the Y chromosome and important genes located on this chromosome.
• Klinefelter Syndrome and Associates
  Klinefelter Syndrome and Associates (http://www.genetic.org/) provides background information to this syndrome as well as a support group for families affected by these sex chromosome disorders.
• XYY The Stereotype Karyotype
  (http://www.pathguy.com/erf/xyy.htm) This site is maintained by an M.D. who is himself XYY and is dedicated to education about the condition and dispelling some of the negative stereotypes. Good links to other forums.
• Turner's Syndrome Society of the USA
  (http://www.turner-syndrome-us.org/) An excellent overview of this condition and a jump site to many other sites about sex determining chromosomes.
• Turner's Syndrome
  (http://www.aaa.dk/turner/engelsk/Turnen.htm) Another site detailing the causes and etiology of Turner's Syndrome. This also has links to many of the organizations that research the condition and provide support to those with this condition

• Anhidrotic Ectodermal Dysplasia
  Anhidrotic ectodermal dysplasia (http://www.ncbi.nih.gov/entrez/dispomim.cgi?id=224900) is a genetic disorder caused by an X-linked recessive gene. In females, this disorder appears as a pattern of tissues with and without sweat glands.

• Dosage Compensation
  Dosage compensation in Drosophila (http://cmgm.stanford.edu/devbio/baker/doscomp.html) is illustrated at this site.

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